Sand-molding machine.



W. G. NORGROSS.

SAND MOLDING MACHINE. J APPLIOATIOI FILED MINES, 1909. 954,399, 9 Patented Apr. 5, 1910. l 24' Buruma 20 the bottom of said 25 other tric with thel piston,

, sion and exhaust ports.

4o the cylinder and is preferabl formed l 'are tv e exhaust '50 area than the 11i 55 Inthe cylinder UNifrEn STATES PATENT OFFICE;

WILLIAM C. NORGROSS, QF TERRE HAUTE, INDIANA.

SAND-NQLDING MACHINE. Y

` Appiicmon ined June a,

To all whom 'it may concern:

Be it known that I, WiLLiAM G. Nominees, a citizen of the United States, residing at Terre Haute, in the county of Vigo and Sta-te of Indiana, have invented new and machines, and its object is to effect avrapi and tlioi'ou li packing of the sand around the pattern y jarring or jolting the support oii which the fiask rests.

The device hereinafter set forth is a modil cation of the machine for which Letters Patent of the United States were granted to ine on Dec. 10, Y `the jolting is produced by a piston reci ro eating in an upright cylinder and stri ing cylinder at each reciprocation the iiask bein carried on the upper end otsaid piston. n that 'atent the pis ton acts as the valve to contro the admission and the exhaust of the compressed air or fiuid pressure which actuates the piston. n the present invention a separate valve is used, preferably annular and concen which strikes said valve reeiprocation and thus at each end of its moves it from one position to another to ef feet the opening and closing of the ladmis-A `In the accompanying is a vertical sectioiialtview of the improved machine, and Fig. 2 is a cross section on the line. 2 2, Fi .,1.

On a. suitaile heavy metallic base-plate 1 is secured the upright cylinder 2. An annular air chamber 3 is located concentric with t in the as shown. 'Flui pressure2 such as'cornpressed air,` is supplied tosaid air chamber through a pipe 4. Duets 5 lead upwardly from saidchamber in the walls of base-plate,

the cylinder and open into said cylinder at a pluralityof points around its inner cira cumfeience, at anniorm distance above the baselate. Slightly above these inlet ports the cylinder with an'annular exhaust chain concentric with said cylinder and provided with an exhaust pipeB opening to the at- Vmcsphere.

Specification of Letters lPatent.

1907, No. 873,584, in which drawing, Figure 1f ports 6, preferably larger in Patented Apr. 5, 1910.

i909. serial No. 500.814.

whose upper part does not fit the cylinder tightly but passes through a cap 10 secured to the upper end of the cylinder/An oil hole'll may be formed in said @op and another one 12 is provided in the upper part of the c linder to feed lubricant to the piston.- The owcr end of the piston is armed witha Vhardened steel plug 13 which strikes upon the baselate when the iston reaches the bottomb the cylinder, n case the piston iscouiitersunk, a filler 14 is placed upon the base plate around the plug to diminish the space to be filled byithc compressed air.

15, and below said packin is a deep circumerential groove 1G inclu in .c considerahle space both above and below tie inlet and exhaust ports. Good sized passages `17 inthe ow the bottom othe piston. n` said groove are two rin the upper one 18 heing the wider and aving an external circumferential groove 19 from which holes 2O run through said ring. The thicknessof this rino'V is less than the depth of the 'groove 1G, so that there is always a' s ace between the wallpf said groove and t e inner side of said ring, att'ording constant communication between the holes in the ring and the passages 17 `in the piston. The/ring is Aof such width that when its groove '19 registers with the inlet ports the exhaust ports 4`are covered by the ring, and vice versa. The lower rin 21 is not so wide as the upper ring, and oth'of them are split so as to sprininto the c linderand have considera le rictional ho d thereon.

The operation is as follower-The parts being in the position shown, air enters the chamber by wliichit is distributed evenly to all the inlet ports through which it asses to the groove 19 in the ring 18 and tlllience through the holes 20 and the passages' 17 .to thelower end of the cylinder, where it exerts `u liftin ei'ect upon the piston.. 'When the piston as risen 'suciently for its lower ange 22 tostrike the lower rin rings will be' slid u wardly, the rst ei'eet of which is .to cut o the air by c osingthe inlet ports, and the second is to open the' exhaust Y orts when the groove 19' registers with t em. The air can then escape suddenly, owing to the large area of said xhaustlports, and the piston willffalland its is a' heavy trunk piston 9,

` plug will 'strike the bottom ofthe cylinder.

piston connect this groovefwith the is ace be'- The piston has one 'or more packing rings ioo 21, both l no i Just before it strikes, the 'rin s will be caught by the upper flange 23 o the piston and carried down to their original position.

It will be observed that the rin 18 is in effect an annular slide valve, whic is actuated by the piston in its reciprocations, and that by using rings 21 of different widths, the lost motion between the piston and the rings can be varied, so as to give the iston more or less travel within certain imits. Ordinarily from one fourth to three eighths of an inch is suilcient to do effective work. As in my former patent, the iiask is sup'- ported upon the table 24 which is carried by the piston. The attern having been put in place and the sang poured upon it, the action of the machine quickly jolts the sand firmly and evenly down around the pattern, packin it better than can be done by hand.

aving thus described my invention what I claim is:

1. In a machine of the class described, the combination of an upright cylinder having a set of inlet ports and a set of exhaust ports inn its walls atderent' levels, an annular slide valve having a circumferential roove adapted to register with said sets o ports alternately, sind valve having holes extending through it from said groove, a piston having a circumferential groove receiving said valve and affording a space between the Wall of the groove and the inner side of the f valve and passages connecting the groove in the piston with the space below said piston. A2. In amachine of the class described, the combination of an upright cylinder having a set of inlet ports and aset of exhaust ports in its walls at different levels, a piston 4havlng a deep circumferential groove and passages connecting said groove with the space below said piston, a sp it ring in said groove having an exterior groove adapted to reg-` ister with said sets of ports and rovided with holes extending from sai oove through said ring, and a second splitrin of predetermined Width below said groove rm 3.g In a machine of the class described, the combination of a base plate having an annular chamber, an air pipe communicating therewith, an upright cylinder having ducts leading from said chamber to inlet ports in the walls of said cylinder, a set of exhaust ports of lar r area than the inlet ports and arranged a ittle distance above the`same, an annular exhaust chamber communicating with said exhaust ports, an annular valve in said cylinder having an exterior groove adapted to register with said ports, a narrower ring below the annular valve, a piston having a deep circumferential groove receiv ing both rings with a certain amountof lost motion, and holes 4and passa es connecting the groove in the valve with t e space below said piston. A

In testimony whereof I have signed my name to this specification in the presence of two subscribin witnesses. i

WV LLIAM C. NORCROSS. Witnesses: Y

HARRY J. BAKER, S. M. THOMAS. 

